Another example of rapid tornadogenesis on the northern flank of this QLCS. Tight rotation formed rather quickly in between 1240-1245Z just northwest of Green Valley, Maryland. Tornado damage would be reported at 1244Z.

At 1242Z, the DivShear image  showed mostly noise with maybe an increased signature in the southeastern portion of Frederick County, Maryland where the tornado circulation would be located. Imporant to note that a TORP object had not been created quite yet, even though we are within a couple minutes of tornadogenesis.

Very soon after the last image, a TORP object with an 85% probability was created at 1245Z (roughly a minute after the first tornado damage report). Also started to show signs of that clover-type look/signature in the DivShear image. It seems that TORP may sometimes struggle predicting these really quick QLCS-type circulations.

Kilometers